Improvement in sewing-machines



N. G. ROSS. Sewing Machine.

Patented March 26, 1861.

UNITED STATES PATENT OFFICE.

NOBLE G. ROSS, OF CINCINNATI, OHIO.

IMPROVEMENT IN SEWING-MACHINES.

To all whom it may concern:

Be it known that I, NOBLE G. Ross, of Oincinnati, Hamilton county, Ohio,have invented certain new and useful Improvements in Sewing-M achines;and I do hereby declare the following to be a full, clear, and exactdescription of the nature, construction, and operation thereof,reference being bad to the annexed drawings, making part of thisspecification.

My invention relates to machines devised to form and work a double-loopstitch; and itconsists in a looper so constructed and operated as totake the needlethread at such distance below the fabric as to enable itto enter the upper loop in its most opened part and to spread its ownloop and shed it so near the fabric as to insure the engagement of theneedle in the lower-loop with a comparatively short stroke of needle andslight wear of thread.

Figure 1 is a view of the machine with the looper in the act of takingthe thread from the needle. operative parts at which the feeder isbrought into action. Fig. 3 is a perspective View of the under side ofthe machine with the looper spread to receive the needle and in the actof shedding its own loop.

A is the cloth-plate; B, a bracket, which projects from the stand-frameand serves to support and guide the needlestock O and springpressure-pad l).

E is the loopershaft, carrying the needledriving cam F. An arm, partlyshown atGr, connects the needle-stock O with the cam F. The part ofshaft E near the sewing mechanism is supported by a bracket, H, andterminates in a wrist, I, which is set sufficiently eccentric to givethe required movement both to the looper and the feeder. The looper J isa bent bar-hook, whose upper portion consists of a rigid and perforatedfinger, i, and a flexible and imperforated finger, t'. The middleportion of looper J has an oblique slot, 1), which,when the machine -isin action, enables the looper to slide, and at the same time oscil- Fig.2 represents that position of the late upon a pin, 0, which is fixed toa greater or less height upon the bracket H, according to the extent ofoscillation desired for the looper. The lower end of the looper isjournaled to crank-wrist I, and partakes of its circular motion. Thewrist I and oblique slot I) combine to give the upper or operative partof the'looper a peculiar eccentric movement, the looper successivelydescending, advancing, ascending, and retreating, so as to engage theneedle-loop some distance below the fabric and to receive the needle andshed its own loop as near as possible to the fabric.

K is a wedge-formed projection called the spreader. The spring portionor flexible finger i of the looper in its retreating movement is openedby its contact with the spreader K, (either directly, as in Fig. 3, orby a projecting pin, as in Fig. 4,) so as to admit the upper needlebetween the lingers t3 and t" and insure the Shedding and engagement ot'the lower loop.

The wrist I is also pivoted directly to the lower end of the feed-bar L,which bar has a vertical slot, 0, adapted to traverse an adjustablefixed pin, 7, when the machine is in motion, the wrist and slotcombining to impart to the upper or operating end of the feed-bar acompound rocking; and endwi'se motion adapted to impart the desiredintermittent feed.

I claim herein as new and of my invention- The obliquely-slotted looperJ, adapted to traverse, when in action, a fulcrum, 0, its lower endreceiving a circular motion from a crank, I, and its upper end thedescribed combined rocking. and np-and-down motion, soas to enter theupper loop at its widest part and to shed its own 100p near the cloth,in the manner and for the objects stated.

In testimony of which invention I hereunto set my hand.

NOBLE G. ROSS.

